Question

4. The age of A and B are in the ratio 5: 7. Four
years from now the ratio of their ages will be
3:4. Then the present age of B is
(a) 20 year
28 years
(c) 15years
(d) 21 years
1
1​

Answer 1

Answer:

(b) 28 years

Step-by-step explanation:

Let the age of A be 5x and B be 7x.

Acc. to ques.

After 4 yrs.

A's age = 5x+4

B's age = 7x+4

And A/q...

5x+4  =   3

7x+4       4

20x+16 = 21x+12

20x+4=21x

4 = 21x-20x

4 = x

i.e. x=4

Therefore Present age of B is 7x = 7(4) = 28yrs